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Divestitures and Assets Held for Sale - Balance Sheet Data Related to Assets and Liabilities Held for Sale (Details) - Held for Sale - Well Services Exit - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventory	$ 580	$ 3,124
Other property and equipment	67,617	95,560
Less: Accumulated depreciation and impairment	(66,817)	(77,056)
Total assets held for sale	$ 1,380	$ 21,628

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